<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 添加角色 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 显示角色 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!--<pre>{{scope.row.children}}</pre>-->
            <el-row :class="['bdbottom', i1===0?'bdtop':'', 'vcenter']"
                    v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二三级权限 -->
              <el-col :span="19">
                <!-- 遍历嵌套渲染二级 -->
                <el-row :class="[i2===0?'':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable
                            @close="removeRightById(scope.row, item3.id)">{{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all="true"
               :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible=false">取消</el-button>
        <el-button type="primary" @click="allowRights">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
  export default {
    data () {
      return {
        // 所有角色列表数据
        roleList: [],
        // 所有权限列表数据
        rightsList: [],
        // 分配权限显示开关
        setRightDialogVisible: false,
        // 树形控件的属性绑定对象
        treeProps: { label: 'authName', children: 'children' },
        // 默认选中的节点ID值
        defKeys: [],
        // 即将分配权限的角色Id
        roleId: ''
      }
    },
    created () {
      this.getRolesList()
    },
    methods: {
      async getRolesList () {
        const { data: res } = await this.$http.get('roles')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.roleList = res.data
      },
      async removeRightById (role, rightId) {
        const confirmResult = await this.$confirm('此操作将删除该权限，是否继续？', '提示',
          { confirmButtonText: '确定', cancelButtonText: '取消', type: 'info' }).catch(err => err)
        if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
        const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        role.children = res.data
        this.$message.success(res.meta.msg)
      },
      // 监听分配权限对话框关闭事件
      setRightDialogClosed () {
        this.defKeys = []
      },
      async showSetRightDialog (role) {
        this.roleId = role.id
        // 获取所有权限数据
        const { data: res } = await this.$http.get('rights/tree')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.rightsList = res.data
        this.getLeafKeys(role, this.defKeys)
        this.setRightDialogVisible = true
      },
      // 递归获取三级权限ID并保存到 defKeys 中
      getLeafKeys (node, arr) {
        // 如果当前 Node 节点不包含 children 属性，则是三级节点
        if (!node.children) return arr.push(node.id)
        node.children.forEach(item => this.getLeafKeys(item, arr))
      },
      // 给角色分配权限
      async allowRights () {
        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: keys.join(',') })
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.getRolesList()
        this.setRightDialogVisible = false
        this.$message.success(res.meta.msg)
      }
    }
  }
</script>
<style lang="less" scoped>
  .el-tag {
    margin: 8px;
  }

  .bdtop {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-top: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
